Judge Bernard Friedman dismissed six of eight counts against two doctors and several mothers accused of having the medical procedure performed on nine girls in a southeast Michigan clinic.

The federal law against female genital mutilation has been on the books for two decades, but the Detroit case is the first time charges had been filed.

In his 28-page decision, Judge Friedman writes, “Congress had no authority to pass this statute under either the Necessary and Proper Clause or the Commerce Clause” of the Constitution. Female genital mutilation is against the law in Michigan and 26 other states.

It’s not known yet if federal prosecutors plan to appeal the judge’s ruling.

Dr. Jumana Nagarwala, Dr. Fakhruddin Attar and one other individual are still facing conspiracy and obstruction charges. Their trial is scheduled for next year.

A federal grand jury questioned additional witnesses in the a female genital cutting case. According to a report by the Detroit News, as many as six people were seen entering the grand jury suite in a federal court Wednesday who appear to be members of the Dawoodi Bohra, the religious community surrounding the case.